tender for supply of equipment for audio systems to be used in court rooms as backup and spare units at calcutta high court..- 1 supply of dual channeldigital power amplifier. minimum requirment :350w@ 4 ohmsper channel, lcd display with dsp, forced air fan privent excessive thermal buildup, frq. resp. 20-20khz. thd 0.5% or better. (make - bose/ electrovoice/shure/sennheiser) 2 supply of automatic microphone mixer, using shures patented intellimix operational concept. intellimix activates only those microphones being addressed, minimizing the poor audio caused by multiple open microphones. automaticgain adjusment as additional microphone are activated , (noma: number of open microphoneattenuator) adjustable eq per channel: low frequency rolloff and high frequency shelving, 48v phantom power selectable for each input., highly rf resistant chassis and circuitry , bi- color led indication of channel activation and clipping , linking capability for systems up to 400 microphones, front panel headphones output with level control , peak responding output limiter with selectable thresh olds and led indicator, freqn. resp. 50hz to 20khz , line output voltage gain : low-impedance mic (150ohms) 80db , line- 40db,aux - 44db, total harmonic distortion (through 20hz 0 20khz filter ; input 1 and master at 5, all other controls full counterclockwise) <0.1% at +18dbv output level , 50hz to 20khz , hum and noise (150ω source ; 400hz - 20khz filter) equivalent input noise -125dbv) equivalent input hum and noise (150ω source; through 20hz-20khz filter) -123dbv; output hum and noise (through 20hz - 20khz filter, channel control full counterclockwise:-90 dbv , master full clockwise : -70dbv., input channel activation : attack time: 4 msec ,hold time0.4 (switchable to 1.0 sec) decay time: 0.5 sec , model no. scm 810, make - shure / sennheiser / mi-das) 3 sitc of 18 desktop gooseneck condenser micro- phone , including cable , connectorattached 10 xlr cable , logic functions , programmable switch and led indicator, attached desktop base, frequency response (figure 1) 50 to 17,000 hz ;polar pattern (figure 2);output impedance (at 1000 hz) rated at 150 ω (180 ω actual)open circuit sensitivity (at 1 khz, ref. 1 v/pascal*) :cardioid: –35.0 db (17.8 mv) ; maximum spl (1 khz at 1% thd, 1 kω load): cardioid: 124.2 db;signal to noise ratio (referenced at 94 db spl) :cardioid: 66.0 db ; dynamic range at 1 kω load 96.2 db,100 db at 0 gain; common mode rejection 45.0 db minimum ,mute switch attenuation (switched models only) 50.0 db minimum ;preamplifier output clipping level (1% thd) – 6.0 dbv (0.5 v),–12 db at 0 gain; polarity:positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector.; power requirements: 11 to 52 vdc phantom, 2.0 ma. (make - shure / sennheiser/ beyer dynamic) 4 supply and installation of microphone wind screen. (make - shure/bosch/sennheiser) 5 add. g.s.t.@ 18% on total value. 6 add. lwc.@ 1% on total value